Delays Irk American Airlines Passengers

American Airlines and its passengers are struggling with a rise in late and canceled flights spurred by pilot-initiated maintenance requests and a shortage of crew members amid a labor dispute.

Flight cancellations at American are running between 3% and 5% a day in an industry where a 1% rate is considered a very bad day. And only about half of American's flights are arriving on time, compared with more than 80% for most large...